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Business segments - Schedule of Segment Reporting Results By Segment (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of business segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 623,091 | $ 617,094 | $ 606,453 | $ 556,722 | $ 578,683 | $ 572,301 | $ 481,794 | $ 467,043 | $ 2,403,360 | $ 2,099,821 | $ 1,700,912
Gross profit | 152,930 | 151,379 | 147,667 | 110,215 | 125,307 | 143,798 | 124,345 | 119,267 | 562,191 | 512,717 | 452,123
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 268,259 | 238,792 | 220,925
Operating income | 81,308 | 84,609 | 77,900 | 42,786 | 61,527 | 71,067 | 62,007 | 65,231 | 286,603 | 259,832 | 225,308
Amortization of intangible assets |  |  |  |  |  |  |  |  | (13,377) | (9,348) | (5,890)
Acquisition-related expenses |  |  |  |  |  |  |  |  | (832) | (4,745) | 0
Gain on sale of a business |  |  |  |  |  |  |  |  | $ 6,880 | $ 0 | $ 0
Percentage of total revenue |  |  |  |  |  |  |  |  | 11.90% | 12.40% | 13.20%
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 58,404 | $ 46,849 | $ 42,778
Other/Corporate |  |  |  |  |  |  |  |  |  |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense | (622) | 2,127 | 0 | 650 | (102) | 8 | 95 | 5 | 2,155 | 6 | 614
Other |  |  |  |  |  |  |  |  | (2,155) | (6) | (614)
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | (3,449) | (3,517) | (3,262) | (3,149) | (3,166) | (3,275) | (1,432) | (1,475) | (13,377) | (9,348) | (5,890)
Acquisition-related expenses | (257) | 0 | (529) | (46) | $ 172 | $ 2,459 | $ 1,514 | $ 600 | (832) | (4,745) | 0
Gain on sale of a business | $ 427 | $ 6,453 | $ 0 | $ 0 |  |  |  |  | 6,880 | 0 | 0
Health Services |  |  |  |  |  |  |  |  |  |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,298,304 | 1,109,238 | 906,650
Gross profit |  |  |  |  |  |  |  |  | 292,181 | 254,108 | 213,728
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 107,155 | 99,815 | 98,172
Operating income |  |  |  |  |  |  |  |  | $ 185,026 | $ 154,293 | $ 115,556
Percentage of total revenue |  |  |  |  |  |  |  |  | 14.30% | 13.90% | 12.70%
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 31,916 | $ 27,694 | $ 23,994
U.S. Federal Services |  |  |  |  |  |  |  |  |  |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 591,728 | 502,484 | 341,840
Gross profit |  |  |  |  |  |  |  |  | 138,168 | 118,646 | 110,793
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 74,792 | 59,252 | 47,695
Operating income |  |  |  |  |  |  |  |  | $ 63,376 | $ 59,394 | $ 63,098
Percentage of total revenue |  |  |  |  |  |  |  |  | 10.70% | 11.80% | 18.50%
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 9,953 | $ 10,363 | $ 9,557
Human Services |  |  |  |  |  |  |  |  |  |  |
Financial information for each of the Company's business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 513,328 | 488,099 | 452,422
Gross profit |  |  |  |  |  |  |  |  | 131,842 | 139,963 | 127,602
Selling, general and administrative expense |  |  |  |  |  |  |  |  | 84,157 | 79,719 | 74,444
Operating income |  |  |  |  |  |  |  |  | $ 47,685 | $ 60,244 | $ 53,158
Percentage of total revenue |  |  |  |  |  |  |  |  | 9.30% | 12.30% | 11.70%
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 16,535 | $ 8,792 | $ 9,227

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